[LinuxPPS] precision

[Udo van den Heuvel]

Rodolfo Giometti wrote:
> On Tue, Oct 30, 2007 at 03:55:48PM +0100, Udo van den Heuvel wrote:
>> Hello,
>>
>> About the recent reports of decreased precision:
>>
>> How could we determine if these changes are related to LinuxPPS or are
>> elsewhere in the kernel?
>> If it's LinuxPPS: what could we improve?
>> How could one optimize the kernel for optimal performance with LinuxPPS?
> 
>From LinuxPPS point of view the PPS events are simply reported to the
> userland, no computation are made on the PPS data.

Sure.
I am not an expert and cannot determine performance differences myself
since I only have on LinuxPPS box.
I believe a saw a change to LinuxPPS sometime agoto record timestamps as
soon as possible?
If that is correct, we cannot change anything much?

> On problem could derive from IRQ latency... but in any case I don't
> see how we can improve it from LinuxPPS code.

I agree.